Continuous-zoom bifocal metalens by mutual motion of cascaded bilayer metasurfaces in the visible

Wang, Chang; Sun, Yan; Zhang, Qiangbo; Yu, Zeqing; Tao, Chenning; Zhang, Jinlei; Wu, Fei; Wu, Rengmao; Zheng, Zhou

doi:10.1364/oe.432183

Cited by 19 publications

(9 citation statements)

References 62 publications

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“…TBML combines geometric phase ψ and propagation phase η. It is known that geometric metasurfaces impart opposite phase distributions for LCP and RCP incidences by rotating unit cells 23 , and propagation phase depends on the geometric parameters of the unit cells and insensitive to the polarization states of the incident light [26][27][28] . Assume a circularly polarized beam is incident on a nanostructure of geometric metasurfaces, the transmitted light can be expressed as = exp( 2 ) -, 22…”

Section: Theoretical Analysesmentioning

confidence: 99%

Continuous-zoom bifocal metalens at visible wavelength

Wang¹,

Zhang

Yu³

et al. 2023

Optoelectronic Imaging and Multimedia Technology IX

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Metasurfaces and metalenses have drawn great attentions since they can manipulate wavefront versatilely with a miniaturized and ultrathin configuration. Here we propose and numerically verify a tunable bifocal metalens with two continuous-zoom foci. This device utilizes two cascaded and circle layers of metasurfaces with different phase distributions for incidences of opposite helicities imparted on each layer by the combination of geometric phase and propagation phase. By relative rotation of both layers, focal lengths of both foci can be tuned continuously with the zoom range for each focus designed deliberately, and the relative intensity of both foci can be adjusted by changing the polarization state of incidence. The proposed device is anticipated to be applied in polarization imaging, depth estimation, multi-plane imaging, optical data storage, and so on.

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Section: Theoretical Analysesmentioning

confidence: 99%

Continuous-zoom bifocal metalens at visible wavelength

Wang¹,

Zhang

Yu³

et al. 2023

Optoelectronic Imaging and Multimedia Technology IX

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“…Up to now, diverse metalenses have been proposed and demonstrated, including spin-controllable metalens [22,23], achromatic metalens [24,25], tunable metalens [26,27] and long focal depth metalens [28,29], etc. It is well known that the multi-foci metalens can play important role in the applications of optical tomography technology, optical data storage, optical communication and photoelectric detection [30][31][32]. In 2015, Chen et al demonstrated a circular polarization sensitive longitudinal threefoci metalens made of gold nanorods by dividing a complete metalens into three annular bands, every annular band corresponds to a focal point [33].…”

Section: Introductionmentioning

confidence: 99%

Multi-foci metalens based on all-dielectric metasurface with simultaneous amplitude and phase modulation

Qin,

Fan,

et al. 2023

J. Opt.

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Metasurface provides a novel platform for designing high efficiency and multi-functional photonic devices with compact size. Multi-foci metalens has great potential in the applications of optical tomography technology, optical data storage, optical communication and photoelectric detection. Here, in order to broaden the functionality and applicability of multi-foci metalens, a scheme for designing multi-foci metalens based on all-dielectric metasurface with simultaneous amplitude and phase modulation is demonstrated. Based on it, a linear-polarization-dependent multi-foci metalens which can focus x-polarization and y-polarization incident wave into multiple focal points independently is designed and demonstrated numerically, the intensity ratio between the x-polarization foci and y-polarization foci can be tuned continuously by varying the polarization angle of incident wave. In addition, the polarization-independent multi-foci metalens and dual-frequency multi-foci metalens have also been demonstrated by utilizing this method, the intensity ratio among these foci can be designed at will. This work is of great significance for the practical applications of multi-foci metalens.

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“…However, in recent years, people have tended to manufacture metalenses with a variable focus to meet various applications and needs rather than being limited to a fixed focus. As a result, various forms have emerged in the study of variable focus metalenses: mechanically stretching the substrate [25][26][27], adjusting the mutual angle between two chiral metasurfaces [28,29], driving the geometrical position between two separate metalenses [30,31], and exploiting a micro-electromechanical-system (MEMS)-integrated metasurface [32][33][34]. The disadvantage is that these zoom metalenses need to be mechanically stretched or moved to achieve the zooming function, and problems such as easy damage, serious mechanical wear, low yield, and a complex overall device structure may occur.…”

Section: Introductionmentioning

confidence: 99%

Mid-Infrared Continuous Varifocal Metalens with Adjustable Intensity Based on Phase Change Materials

et al. 2022

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Metalenses can greatly reduce the complexity of imaging systems due to their small size and light weight and also provide a platform for the realization of multifunctional imaging devices. Achieving dynamic focus length tunability is highly important for metalens research. In this paper, based on single-crystal Ge and a new low-loss phase change material Ge2Sb2Se5 (GSSe), a tunable metalens formed by a double-layer metasurface composite was realized in the mid-infrared band. The first-layer metasurface formed by Ge nanopillars combines propagation and the geometric phase (equivalent to a half-wave plate function) to produce single- or multiple-polarization-dependent foci. The second-layer metasurface formed by GSSe nanopillars provides a tunable propagation phase, and the double-layer metalens can achieve the tunability of the focus length depending on the different crystalline fractions of GSSe. The focal length varies from 62.91 to 67.13 μm under right circularly polarized light incidence and from 33.84 to 36.66 μm under left circularly polarized light incidence. Despite the difference in the crystallographic fraction, the metalens’s focusing efficiency is maintained basically around 59% and 48% when zooming under RCP and LCP wave excitation. Meanwhile, the incident wave’s ellipticity can be changed to alter the relative intensity ratios of the bifocals from 0.03 to 4.26. This continuous varifocal metalens with adjustable intensity may have potential in practical applications such as optical tomography, multiple imaging, and systems of optical communication.

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Continuous-zoom bifocal metalens by mutual motion of cascaded bilayer metasurfaces in the visible

Cited by 19 publications

References 62 publications

Continuous-zoom bifocal metalens at visible wavelength

Continuous-zoom bifocal metalens at visible wavelength

Multi-foci metalens based on all-dielectric metasurface with simultaneous amplitude and phase modulation

Mid-Infrared Continuous Varifocal Metalens with Adjustable Intensity Based on Phase Change Materials

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